Tropical Depression 17L

Passive Microwave (PMW) Intensity Information
Hurricane Intensity Estimation (HIE) Algorithm
Version 9.0


         Overpass     Inten           Ring    Ring          Wind           Forecast        Final        Target  
       Date    Time   Score  Meaning   Pct    Diam  BTdiff   Est   Sat    Lat    Lon    Lat    Lon    Lat    Lon              
     20210919 065924 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI16  11.4   27.9   11.4   27.9   10.9   28.8 Analysis Plot     
     20210919 154645   -1.0      N/A  35.6%  33.33     .98  30.0  AMSR2  13.3   28.8   13.3   28.8   13.5   29.3 Analysis Plot     
     20210919 204558   -1.6      N/A   8.2% 188.87    1.55  35.0 SSMI17  14.1   29.7   14.1   29.7   13.7   29.6 Analysis Plot     
     20210920 035939 -930.0      N/A   N/A     N/A    0.00  35.0  AMSR2  15.6   31.4   15.6   31.4   16.7   31.5 Analysis Plot     
     20210920 100327    N/A      N/A   N/A     N/A     N/A  35.0 SSMI17  15.9   32.6   15.9   32.6   16.9   32.6 Analysis Plot     
     20210920 183831   -1.8      N/A   N/A   44.44    1.77  35.0 SSMI18  17.8   33.8   17.8   33.8   18.3   33.9 Analysis Plot     
     20210920 185902   -2.5      N/A   N/A   44.44    2.52  35.0 SSMI16  17.9   33.9   17.9   33.9   18.3   33.9 Analysis Plot     
     20210920 203231   -1.9      N/A   N/A   33.33    1.86  35.0 SSMI17  18.2   34.1   18.2   34.1   18.5   33.7 Analysis Plot     
     20210921 080230   -3.4      N/A   N/A   33.33    3.35  45.0 SSMI18  19.6   35.9   19.6   35.9   20.5   36.6 Analysis Plot     
     20210921 083603   -0.9      N/A   N/A   11.11     .95  45.0 SSMI16  19.6   35.9   19.6   35.9   19.5   36.5 Analysis Plot     
     20210921 094909   -1.1      N/A   N/A  155.54    1.06  40.0 SSMI17  21.0   36.4   21.0   36.4   21.0   36.6 Analysis Plot     
     20210921 153610   -2.8      N/A   8.2% 222.20    2.81  35.0  AMSR2  21.6   36.9   21.6   36.9   21.9   36.8 Analysis Plot     
     20210921 184023   -1.7      N/A   N/A  188.87    1.72  35.0 SSMI16  22.0   37.2   22.0   37.2   22.0   37.0 Analysis Plot     
     20210922 074831   -0.1      N/A   5.5% 122.21     .09  35.0 SSMI18  23.3   38.3   23.3   38.3   23.0   38.3 Analysis Plot     
     20210922 082257   -2.9      N/A   4.1% 199.98    2.89  35.0 SSMI16  23.4   38.3   23.4   38.3   23.0   38.5 Analysis Plot     
     20210922 162015   -6.8      N/A   N/A  155.54    6.75  30.0  AMSR2  23.7   39.3   23.7   39.3   23.8   39.5 Analysis Plot     
     20210922 181816 -930.0      N/A   N/A     N/A    0.00  30.0 SSMI18  23.8   39.5   23.8   39.5   23.7   39.5 Analysis Plot     
     20210923 043930   -1.3      N/A   N/A   22.22    1.32  30.0    GMI  24.8   41.1   24.8   41.1   25.0   41.2 Analysis Plot     
     20210923 113815   -2.1      N/A   N/A  155.54    2.10  30.0 SSMI17  25.4   41.7   25.4   41.7   25.6   41.6 Analysis Plot

Legend:

  - Date/Time are determined from PMW imagery at Forecast (initial guess) Lat/Lon position.

  - Positive/Negative Latitude = North/South Hemisphere; Longitude = Western/Eastern Hemisphere.

  - "Ring Diam" value indicates the estimated surface eyewall diameter in km (the MI eyewall edge diameter minus 10 km).

  - "Ring Pct" is the percentage of the "ring" (eyewall inner boundary) that is 1) colder than the "hot spot" (warmest eye pixel) in the eye by 20K, or 2) the percentage that is a) colder than 232K and b) colder than the "hot spot" by 10K, whichever is greater.
  - Values are red if Ring % <= 65, yellow/brown if Ring % <= 85 and green if Ring % > 85.

  - "Tb diff" is the difference between the "hot spot" (warmest eye pixel) and the warmest pixel on the eyewall.

  - Intensity score are listed as negative, and not used, when the JTWC or NHC estimated Vmax is <55 kts in order to rule out weak but highly symmetric TCs.

  - Error messages in intensity scores: -920 is used when the hottest pixel in the eye is <200K, to prevent false positives; -930 means <85% of eyewall has observations/data.